import java.util.ArrayList;
import java.util.List;
import java.util.Random;

public class Cards {
    public static final String[] suits = {"♥", "♠", "♣", "♦"};

    //4个花色 13张牌
    public List<Card> buyCard() {
        List<Card> cardList = new ArrayList<>();
        for (int i = 0; i < 4; i++) {
            for (int j = 1; j <= 13; j++) {
                int rank = j;
                String suit = suits[i];
                Card card = new Card(rank, suit);
                cardList.add(card);
            }
        }
        return cardList;
    }

    public void Shuffle(List<Card> cardList) {
        Random random = new Random();
        for (int i = cardList.size() - 1; i > 0; i--) {
            int randIndex = random.nextInt(i);
            swap(cardList, i, randIndex);

        }
    }

    private void swap(List<Card> cardList, int i, int j) {
        //Card tmp =cardList[i];
        Card tmp = cardList.get(i);
        //cardList[i]=cardList[j];
        cardList.set(i, cardList.get(j));
        //cardList[j]=tmp;
        cardList.set(j, tmp);
    }

    //3个人，每次轮流抓5张牌
    public void drawCard(List<Card> cardList) {
        List<Card> hand1 = new ArrayList<>();
        List<Card> hand2 = new ArrayList<>();
        List<Card> hand3 = new ArrayList<>();

        List<List<Card>> hands = new ArrayList<>();
        hands.add(hand1);
        hands.add(hand2);
        hands.add(hand3);

        for (int i = 0; i < 5; i++) {
            for (int j = 0; j < 3; j++) {
                Card card = cardList.remove(0);
                List<Card> tmpHand = hands.get(j);
                tmpHand.add(card);
            }
        }
        System.out.println("第1个人抓的牌" + hand1);
        System.out.println("第2个人抓的牌" + hand2);
        System.out.println("第3个人抓的牌" + hand3);
    }
}
